Which versions of Regex does KM use?

Questions & Suggestions
1

I posted a regex question on another forum and I was asked which version of Regex.

php? perl? c#? python? javascript?

2

I am almost certain that KM uses the built-in regex capabilities of NSString and NSRegularExpression, which use ICU Regular Expressions.

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3

As shown in the KM Editor Help menu:
ICU Regular Expressions

This is very similar to PCRE, which you will often find in RegEx tools like RegEx101.com

For more info, see:
Regular Expressions (KM Wiki)

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